Multistage centrifugal pump.



A. GIESLER. MULTISTAGE OENTRIFUGAL PUMP.

APPLICATION FILED MAY 8, 1905.

Patented Feb. 1, 1910.

aa'rimneinsmn, ofnayromomo, ASSIGNOB r THE PLATT men worms 00., or i; navromomo, ACORPORATION or OHIO. ,i

" V act a al: CENTRIFUGAL PUMP.

To all whom it may concern: I i j I Be it known that I, ARTHUR Ginsnan, a

.citizen-- of 'the United States, residing at apart. This is an important item 111 the in- Dayton, in the county of Montgomery and State of Ohio, have inventedcerta'in new and useful Improvements in Multistage- "Centrifugal Pnmps;and'l do declare the following to be a full, clear, and exact descrlption of the invention, such as will enable others skilled in the art to which it apertains to make anduse the same, reference ing had to the accompanying drawings,

and to-the letters ofrefcrencemarked thereon, which form a part of this'specifi'cation.

' This invention relates to improvements in centrifugal pumps, especially of the multipie-stage type, and the object of the invention genera lyspeaking, is to' improvethe eliiciency and. 'simpli y the construction thereof. Y

In obtaining the desired efiiciency, I ba.l

' ancetheend thrust ofthe pump, which is 'alwaystoward' the suction end, as near as possible, by a proper construction, and for the fractional unbalanced part of the end thrust that cannot be balanced without making experiments with every pump, 1 provide a positive collar 'be'aring'which prevents the least ossible' friction and thus increases the usefu efiiciency of the pump, The efficiency 7 is also due to other structural features,

among: which may mentioned the construction of the orts. cause muchfrictlonal resistanceare avoided by constructing the ports in the pump casin "where ample space' for'large ports is a1 owed. Asa consequence, the flow of water is even and at low speed. The many parts found in centrifugal pumps, demand a great many joints and fits, which are when new, subject to leakageand "thus decrease the efliciency. After a period of usage these joints are subject to corrosion and the parts therefore, become difficult to dismantle. To avoid these difficulties, I have endeavored tohave as few individual pieces as is compatible with good design.

A further object of the invention is to so construct a pump of the above type that the suction end thereof may remain unbroken or, undisturbed after the amp is installed. In other words, the coupii amp is connected to the motor, for example, electrical, steam gas .or watermotnr, ison the suction side 0 i end of the pump.

Short curves which tionary ports g-g v rection into the ports a'a ng by which the th? pum and if repair- *see ww as. Patented eni, i910. Applicationfiledmay 8, 1905. I

Serial No. 259,30el.

need not be broken vto take the entire pump stallation of all pumps and especially pumps of this type. All parts of the pump, staing of the working parts shouldibeco me necessary, the connection to the suction pipe tionary as well as rotary may be removed from t he discharge end.

In a detailed description of my invention, the drawing is referred to, the same being a sectional view of afour stage pump.

In the following description, similar reference characters will parts.

A is the suction pipe connected to the pump cover .B WlllCll closes the suction The cover I) is connected to the pump casing H which is of cylindrical form and is made in one casting from end to end. 'lhe swelled portions of said casing are provided with a multiplicity of cross ports a-a' which register with ports 6-?! in a double port plate 1-4. In this double port plate there is a diaphragm or divison plate K which separates the ports ?--b, the said double port plate and the diaphragm being in a single casting joined by a suitable number of vanes c-. The

indicate corresponding vanes 0 form ports between them; and the ports Z)-b are continuations of said ports to conduct the liquid to be pumped, to the right and left impellers.

I is a single port plate at the delivery end of the pump, and the same in construction as the double port plate, with the exceptionthat it'is single, and conducts the water or liquid to the last impeller. For simplicity of manufacture and as affording the advantagesrdf strength, etc, this single port plate and the delivery pipe M are made in one casting.

CCC- and C are a series of four impellers oil pump shaft D with a multiplicity of ports e-e' between the impeller vanes and which ports, dischar e into stain rings when the pump is rotating. Separating the impellers are divison plates E which have the peripheral guide rings G which guide the Water or liquid from the impellers in a radial diin the pump' casin It is obvious that any desirednumher 0 impellers may be employed by lengthcasing to accommodate.- the ening the pump num er. he rawin'g shows-four, thelast one being at the delivery end of the pump and discharging into the delivery pipe l\ The water in its exit passes from the last impeller into the cross ports a in the pump casing, and thence into thedelivery pipe.

The number of ports aa' in the pump casing-increases according to the diameter of the pump.

Theoretically, each impeller is balanced by entering the wafer from-opposite directions or in pairs. but in practice there is an unbalanced thrust toward the suction pipe,

- which may becaused either in the suction pipe or by leakage between the runners. This unbalanced thrust. is balanced through the medium of a hub J which is constructed integrally with the last impeller and has its inner surface concaved to direct the water to said last impeller. This hub J, when properly dimensioned, will balance the pump toward thesuction end. and any liquid that mayleak through the running joint f will discharge'through a pipe ()wing to the diflieulty in obtaining the proper dimen sions of -the hub J, an end thrust bearing for the pump shaft is provided to keep the. pump in an exact path of rotation and to take up any minus or over-balancing. This end thrust bearing consists of a stud shaft/1 which is screwed or otherwise rigidly secured to the end of the pump shaft, and has upon it a multiplicity of ,i'igid collars h'..

X is a bolt of which there may be any do sired number employed for uniting the parts of the pump. The drawing was prepared with a View. to having five bolts, the lower bolt being in a correct position and on the line of the section, while the upper boltis' shown in the distance, away from the line of the section. These bolts pass through the struction, as other means may be employed for uniting the parts of the pump. Y Y

The numerous arrows clearly illustrate the course of the Water entering the suction end of the pump. It passes under suction pressure between the vanes of the first impeller, thence through the ring ports g into the cross ports a in the pump casing. From ports a it passes into ports I) in the double port plates and thence into ports cf of the second impeller and-into the cross ports-m in the pump casing. This circuit is repeated according to the number-of impellers until the delivery end of the pump 1s'reached,

Having described my'invention, I claim:

impellers arranged with their inlets facing in opposite directions, passage ways adapted to conduct the fluid from one impeller to the othem'and means mounted at t1 e intermediate inlet of the last impeller or balancing the thrust of the pump.

2. 'In a multistage centrifugal pump, two. sets of impellers, each set consisting of two impellers arranged with their inlets facin in opposite directions, passage ways adapte to conduct the fluid from one impeller to the next, and means mounted at the intermediate inlet of the last impeller for balancing the thrust of the pump. v i 3. In a multistage centrifugal pump, a pump casing having cross ports therein, a. port plate and a delivery-pipe registering respectively with said cross ports, impellers arranged with their inlets facing in opposite directions, and a balancing hub at the inlet of one of said impellers and forming a guide to the entrance of said impeller.

In testimony whereof I aflix my signature, in presence of two witnesses.

ARTHUR GIESLER. 1

\Vitnesses:

R. J. MCCARTY, G. M. THEOBALD.

1. In a multi-stage centrifugal pump, two 

